Fix the launcher so that it can give an environment even if buildvars is not present.
Environment now includes scons for standalone builds.
Fixes and cleanup for the install documentation.
scons TEMPLATES updated to define the optionfile version by default.
...mumble
finley no longer imports escript into the default namespace
...

Updated install guide to include the correct version of python.
Updated Mac build instructions not to use numarray or frameworks.
Removed (commented out) references to MacPorts in the Mac instructions.
- These need to be updated and Artak isn't here.
Removed (commented out) references to windows in the install guide.
CSIRO won't have a windows release ready yet.